I make a point of NOT initiating as he gets scared when I do, so when he isn't in the mood I don't mention it.
I do wear nice clothes (but then all my clothes are nice) and I will smile a lot and be chatty and use eye-contact a lot and ask about what things he has been up to.
If he holds my hand I will squeeze his hand to recipricate, but I don't do anything further with him unless he kisses me first and makes his intention very clear.
Once it has got to the ML stage, I then get very assertive, 'do this to me', 'I love that' etc and he usually responds very well with what he loves about me and seems to like me taking charge.
Afterwards I will say 'Next time we ML I want this and that and the other' so he knows what he's got to look forward to! Then I go back to being friendly and affectionate but passive.
Then I will treat him like a fond friend until the next time he wants to ML. It seems to work as our R is slowly (very slowly) developing and he is gradually relaxing into a partner role.